Metal Science and Heat Treatment

Kaibyshev, R.

doi: 10.1007/s11041-010-9238-1pmid: N/A

Kaibyshev, R.; Skorobogatykh, V.; Shchenkova, I.

doi: 10.1007/s11041-010-9239-0pmid: N/A

Prospects of commercial use of new-generation martensitic thermomechanical steels created on the basis of Fe – 11% Cr steels are considered. The physical causes of degradation of mechanical properties in the process of creep of these steels at ≥ 590°C are studied in detail. It is shown that the degradation is connected with formation of the Z-phase. The mechanisms of formation of the phase are described.

Kipelova, A.; Belyakov, A.; Skorobogatykh, V.; Shchenkova, I.; Kaibyshev, R.

doi: 10.1007/s11041-010-9240-7pmid: N/A

Processes of segregation of carbides and evolution of dislocation structure in tempering of steel 10Kh9K3V1M1FBR in the temperature range of 300 – 800°C and their effect on the mechanical properties are studied.

Dudko, V.; Belyakov, A.; Skorobogatykh, V.; Shchenkova, I.; Kaibyshev, R.

doi: 10.1007/s11041-010-9241-6pmid: N/A

Changes in the structure of steel 10Kh9V2MFBR after creep tests are studied. It is shown that annealing causes inconsiderable changes in the structure of troostomartensite formed due to tempering in the head of a specimen. In the functional part of the specimen, on the contrary, the place of the initial troostomartensite is taken by coarse equiaxed subgrains; the density of the lattice dislocations decreases by an order of magnitude. The change in the microstructure in the process of creep causes a more than 30% decrease in the hardness of the material.

Kipelova, A.; Belyakov, A.; Skorobogatykh, V.; Shchenkova, I.; Kaibyshev, R.

doi: 10.1007/s11041-010-9242-5pmid: N/A

The evolution of microstructure in steel 10Kh9K3V1M1FBR during creep and in aging at 600 – 650°C is studied. The results are compared with data for steel P91. The role of cobalt in growth in the long-term strength is considered.

Mogucheva, A.; Nikulin, I.; Kaibyshev, R.; Skorobogatykh, V.

doi: 10.1007/s11041-010-9243-4pmid: N/A

The mechanical behavior of steel 08Kh18N8D3BR in the temperature range of 500 – 740°C at deformation rates of 1.3 × 10– 5 – 1.3 × 10– 2 sec– 1 is studied. The conditions of manifestation of the Portevin – Le Chatelier effect in the steel are determined. The causes of the action of copper on the mechanical properties of the 18Cr – 8Ni-type steel are discussed.

Nikulin, I.; Kaibyshev, R.; Skorobogatykh, V.

doi: 10.1007/s11041-010-9244-3pmid: N/A

The strain behavior of austenitic steel 02Kh18N8G2FV2AB in static tensile tests is studied in a wide range of temperatures (23 – 740°C) and deformation rates (1.3 × 10–5 – 1.3 × 10–2 sec–1 ). The influence of the Portevin – Le Chatelier effect on the strength and ductility of steel 02Kh18N8G2FV2AB at elevated temperatures is determined. The relation between the characteristics of static strength and the creep resistance of the steel is considered.

Kaletina, Yu.; Fokina, E.

doi: 10.1007/s11041-010-9245-2pmid: N/A

The effect of magnetic fields on martensitic transformation in austenitic steels and alloys at low temperatures is studied. Under specific conditions magnetic fields can initiate the appearance of martensite in austenitic alloys or increase its content in steels with austenitic-martensitic structure. This causes changes in the physical and mechanical properties of the material and this should be allowed for when the metal is used in devices operating at cryogenic temperatures in the presence of strong magnetic fields.

Borisov, I.; Levitan, L.

doi: 10.1007/s11041-010-9246-1pmid: N/A

The possibilities of the use of deep-hardening steels for fabricating rolls up to 2200 mm in diameter are studied for steel 35KhN3MFA as an example. The mechanical properties of the metal are studied for cooling rates ranging within 4000–50 K/h in short-term tests at 20–550°C. The method of finite elements is used to compute the temperature field and the variation of temporary and residual stresses over the cross section of a backup barrel quenched after taper and volume heating.

Kchaou, M.; Durand, D.; Dammak, F.

doi: 10.1007/s11041-010-9247-0pmid: N/A

Hardening of steel after induction surface heating is studied. Amodel of the process of hardening of a cylinder is created and subjected to numerical simulation in order to determine the stresses formed in the part. Two principal methods for describing the variation of the stress state during the treatment are developed. Residual stresses are analyzed in both models and compared with the results of an x-ray study. The correlation between the measured data and the numerical results is discussed.